Gas turbine power plant control apparatus including a two-shot shutdown system

ABSTRACT

A gas turbine power plant is provided with an industrial gas turbine which drives a generator coupled to a power system through a breaker. The turbine-generator plant is operated by a hybrid control system having digital function capability during sequenced startup, synchronizing, load buildup and steady state load, and shutdown operations. The control system also contains monitoring and protective subsystems which function through all stages of operation, with redundancy and permissive features which maximize turbine availability.

United States Patent 11 1 1111 3,924,141

Yannone et al. Dec. 2, 1975 GAS TURBINE POWER PLANT CONTROL 3,600,887 8/1971 Gault 60/223 APPARATUS INCLUDING A TWOSHOT 3,611,717 10/1971 Tissier..... 60/39.]4 SHUTDOWN SYSTEM 3,691,759 9/1972 Scheerer. 60/39.]4

3,805,517 4/1974 Sewell 60/223 [75] Inventors: Robert A. Yannone, Aldan; James J.

Shields Philadelphia both of Primary E.\'aminerG. R. Simmons [73] Assignee: Westinghouse Electric Corporation, y, ge 0 F m-S A. Seinberg Pittsburgh, Pa.

[22] Filed: June 20, 1973 [57] ABSTRACT PP 371,627 A gas turbine power plant is provided with an industrial gas turbine which drives a generator coupled to a 52 US. Cl. 290/40; 60/3914 290/38- POWer System through breaker- The u 7 322/38 generator plant is operated by a hybrid control system [51' Int. c1. H02P 9/04 having digital function Capability during sequenced [58] Field of Search 290/40 402- Mame Synchronizing lead buildup and steady ate 6O/66O 667 3914 290/37 5 load, and shutdown operations. The control system a a y 322/38 also contains monitoring and protective subsystems which function through all stages of operation, with [56] References Cited redundancy and permissive features which maximize t b' 'l b'l' UNITED STATES PATENTS me a 2,497,948 2/1950 Lincoln 290/38 5 Claims, 39 Drawing Figures zc 25o PEAK p HP SYS.RES. P l 251 203 BASE s 12x11 TEMP. ifi r iin coumzs f(TZT) $38113? We zc/ TOTAL g1oART AMBIENT s CONTROL TEMP B/P TEMP. SENSORS CONT'ROL T23l iC/p (STARTlNG a. EXH

25B TRANSIENT) .J' .B/P BLADE PATH THERMOCOUPLES, T217 ACCEL. Low

z'r/ 204 SIGNAL SPEED LOAD; SELECT (LSS) zc I LOAD --9 (EN) TOTAL RATE zoe SPEED 1 SPEED LOAD 23] CHANGER 5 CONTROLLER -s5s zos SPEED ,fl SENSOR es-rw s51. LOAD FAST CHANGER NORMAL LOAD RATE F Lss OUTPUT Patent Dec. 2, 1975 Sheet 1 of 26 3,924,141

US. Patent Dec. 2, 1975 Sheet20f 26 3,924,141

U.S. Patent Dec. 2, 1975 Sheet 3 of 26 Tl/D8 r I. 1HOUR qg TIMER MANUAL COUNTER AT ONE RESET I RESET H To 2 SHUTDOWN COUNTER OR COUNTER AT ZERO CONDITIONS MASTER A I ICONTROI. (4Y1) LOCKOUT SIGNAL MIN 'LSX TWO-SHOT BASE OR A RESTART (Rzx) S PEAK LU D. (A

---:?::2:' T 7 [4D r- 14c US. Patent Dec.2, 1975 Sheet40f 26 3,924,141

mm Dwwmmu mum/3 690 A QEDQ :0 JwDu 9 Q0592 Ilv QOPDmEPmE US. Patent Dec. 2, 1975 Sheet 5 Of 26 zc /Z5O PEAK PZC/ HPZC) SYS. RES. P l

BASE 25| 203 s EXHAUST HT EXH TEMP THERMOCOUPLES, 2T 825? L I P 267 52X TOTAL o START AMBIENT CONTROL TEMP I B/P TEMP. T23] SENSORS cONTROL 1C/p f/ 253 (STARTING a EXH 258 TRANSIENT) K I B/P BLADE PATH HT I h THERMOCOUPLES 2T AccEL. LOW

zT/ 204 SIGNAL SPEED LOADI SELECT AD ILSSI zc LO A (B/V) TOT L RATE SPEED SPEED LOAD CHANGER CONTROLLER 205 SPEED SENSOR Li 65-FN 65L LOAD FAST CHANGER NORMAL |88 LOAD RATE I ss OuTPuT Fig.5

US. Patent Dec. 2, 1975 Sheet7 of 26 3,924,141

MIN LOAD KR.CLOSE s am 50% SPEED SPEED LOAD BLADE TEMPERATURE s's s Fig. 6C

SYST

LOADING M RS3 VE PZC Fig, 6B

TEMPERATURE US. Patent Dec. 2, 1975 Sheet 8 0f26 3,924,141

EXH

LOAD

SPEED LOAD LSS ACCEL umoRmt BR LRL H 209 I56 l coMP.mscH. ACCEL- LIMIT TOTALIZER LSS OUTPUT Fig 7A COMBUSTOR l FLM 2 am-1 Sheet 10 of 26 TO STORAGE \\FLM1 l FLMX 2 FLMll FLM 8 FROM FUEL OI L PUMP IOI i US. Patent Dec. 2, 1975 |25VDC POP GLIDE I I30 RUN POS NON/i l- P-T POSITION FLZME END GLIDE TlME OPEN 20% ISOLATION .SPEED 3: mm: mmmmm MINNOZ 1.s------7 PRE- FIRE POSITION I U.S. Patent Dec. 2, 1975 Sheet 11 of 26 3,924,141

I TYPICAL START I4- i !3- 0 l2 E 2 II- 8 Io- 2 El 2 9- $1 LOAD RATE LIMITER LSS INPUTS, PSIG TIME MinuTes 

1. A gas turbine electric power plant including a gas turbine having a compressor, combustion and turbine elements, a generator coupled to said gas turbine for drive power, a generator breaker for coupling said generator to a power system, a fuel system for supplying fuel to said gas turbine combustion element, and a shutdown system for shutting down the operation of said gas turbine, said shutdown system comprising: a. a plurality of monitoring circuits, each having means for signaling the occurrence of a specified condition in the operation of said turbine requiring shutdown of same; b. means for shutting down said turbine upon receiving a signal from one of said monitoring circuits; c. means for enabling automatic restart of said turbine after such a shutdown, when the condition causing shutdown is removed; d. a count-down counter connected to each of said monitoring circuits such that it is counted down upon each occurrence which causes a shutdown; e. a timer connected to said counter and adapted to reset said counter after a predetermined time period; and f. means for disenabling said enabling means when said counter has counted down to a predetermined level.
 2. The gas turbine electric power plant as set forth in claim 1, wherein said timer times a one hour reset period.
 3. The gas turbine electric power plant as described in claim 2, wherein said counter produces a disenabling signal after counting down two times.
 4. The gas turbine electric power plant as described in claim 3, wherein said enabling means comprises means for switchably connecting power to said monitoring circuits, such that when the condition causing shutdown is removed the monitoring circuit generating the shutdown signal ceases to generate such shutdown signal.
 5. The gas turbine electric power plant as described in claim 4, wherein each of said monitoring circuits includes an alarm which is activated upon each such shutdown occurrence. 